| Citation: | YANG Xufeng, SHEN Shidian, WEN Changlong, et al. Prediction of fretting fatigue life with consideration of stress gradient and relative slip amplitude[J]. Journal of Aerospace Power, 2026, 41(8):20250319 doi: 10.13224/j.cnki.jasp.20250319 |
Focusing on TC11 titanium alloy, a fretting fatigue life prediction method considering stress gradients was established by employing the critical plane method and stress field intensity approach. This life prediction model could predict fretting fatigue life by forecasting the stress field intensity of the SWT (Smith-Watson-Topper) critical plane damage parameter within the fatigue-affected region. Using a conventional uniaxial fatigue testing machine and a transverse hydraulic loading device, a tunable tangential stiffness clamping device was designed, and fretting fatigue tests considering the influence of relative slip amplitude were conducted. The tests indicated that under the same force load, the fretting fatigue life initially decreased and then increased with the increase of relative slip amplitude. The model parameters were fitted by combining fretting fatigue test data, and the relative slip amplitude parameter was introduced into the life model, which resulted in a fretting fatigue life prediction method considering the effects of stress gradients and relative slip amplitude. The validity of the proposed method was verified using fretting fatigue test results of dovetail joint structure, with a prediction error within a 3 times dispersion band compared with testing average life.
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